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Cryotherapy is a technique, a very cold liquid or instrument used to freeze and destroy abnormal skin cells that require removal. The technology has been since the turn of the century, but modern techniques make it widely available to dermatologists and general practitioners. The technique is also called cryosurgery. Cryotherapy can be used on a variety of benign skin tumors such as warts, precancerous lesions (actinic keratoses that) is not destroyed, and malignant lesions (such as basal cell and squamous). The goal of cryotherapy to freeze and destroy targeted skin growths while preserving the surrounding skin injury. Cryotherapy is not recommended unacceptable to certain areas of the body because of the danger of destruction of tissue or scarring. These areas are: skin, nerve superimposed on the corners of the eyes, the skin fold between the nose and lips, the skin around the nose, and the border between the lips and the rest of the face. Lesions that are suspected or known malignant melanoma, should not be treated with cryotherapy, but should instead be removed surgically. Similarly, basal cell or squamous cell carcinomas on the basis of a previously treated tumor were again also be surgically removed. If it is not clear whether benign or malignant growth, tissue must be taken for analysis (biopsy), destroyed by a pathologist before any attempts of the lesion with cryotherapy. Caution in individuals with diabetes or circulatory problems, if cryotherapy for certain vintages on their lower legs and ankles is considered, and feet are taken.